Laserfiche WebLink
22 November 2006 <br /> AGE-NC Project No. 95-0167 <br /> Page 12 of 15 <br /> ,.� soil remediation. Therefore, extraction equipment and monitoring costs would be included under soil <br /> vapor extraction estimates. <br /> 6.2. GROUND WATER EXTRACTI0N <br /> r1 There are several different methods for treatment of extracted ground water, which are collectively <br /> J called "pump and treat'. As the name indicates, all methods involve extraction and transfer of <br /> contaminated ground water from the aquifer to an aboveground treatment or disposal/recycling <br /> l' I facility. The extraction is performed using an automatic pump system to maintain capture <br /> characteristics in the aquifer and to assure that process volume requirements are maintained. After <br /> treatment, the water is typically discharged into a storm drain or sanitary sewer. A waste discharge <br /> permit is usually required for discharge. <br /> rJ <br /> I_J 6.2. 1 , BASIC PRINCIPLES <br /> There are several different methods for treatment of extracted ground water, which are collectively <br /> L _J called "pump and treat' . As the name indicates, all methods involve extraction and transfer of <br /> contaminated ground water from the aquifer to an above-ground treatment or disposal/recycling <br /> facility. The extraction is performed using an automatic pump system to maintain capture <br /> ( � characteristics in the aquifer and to assure that process volume requirements are maintained. After <br /> treatment, the water is usually discharged into a sanitary sewer. A waste discharge permit is usually <br /> required for discharge to the City of Stockton. <br /> l <br /> 6 .2 .2. TREATMENT METHODS <br /> i <br /> The documented presence of hydrocarbons will require treatment for the recovered water. Two of <br /> j the most common methods of water treatment are air stripping and carbon adsorption. Air stripping <br /> I J involves removal of volatile organic compounds from ground water by promoting the transfer of <br /> contaminants from the dissolved phase to the vapor phase. Carbon adsorption utilizes granular <br /> activated carbon to simply "filter" organic compounds out of ground water. <br /> L_ <br /> A third, but less common method of above-ground treatment of water is bioremediation. <br /> Contaminated ground water is "treated" by adding hydrocarbon-degrading microbes or by <br /> (L augmenting natural hydrocarbon degradation activities with the introduction of nutrients. <br /> IJ <br /> -� Advanced GeoEnviromnental, Inc. <br /> lS; <br /> f'. <br />